u/WWG0N3WGA , I completely agree with you. I used to wonder about this, too. FWIW, here's my take on it:

Many, many ancient cults were built around blood rituals, cannibalism, and human sacrifice, especially child sacrifice. This was happening all around the world. One of the most important things about the spread of Christianity was that it halted these practices

The people were told, in essence, "You no longer have to sacrifice your children, or any other humans, in an effort to appease your gods. God did that for you when he sent His only son to earth to serve as the final sacrifice. It's no longer necessary, so stop doing it."

The Eucharist is puzzling to many. Some ask, "Why would we drink his blood? Why would we eat his flesh?" The answer is: We aren't. That's the point.

The bread and wine take the place of the human flesh and blood, because Christ instructed us to substitute them. The bread and wine are just as good ("this is my blood you drink, this is my body you eat") as long as we remember the sacrifice that Jesus made so we do not sacrifice - and consume - an actual human ever again ("if you would remember me when you eat and drink.")

Christ was the final human sacrifice and it's supposed to stay that way. That's why He was called "the lamb of God." It was not because he was weak or foolish, as sheep are usually seen as being. It's because lambs were very commonly sacrificed in the rituals of Jesus' time, whenever human children weren't being used.